That is abundantly clear.
And because he doesn't discern what is Christian and what is not his flock is left to the wolves.
Many don't like him because he's got his finger on the pulse of what's wrong with many of God's people: they don't have joy, they're not overcomers in their lives, and are therefore of little use to God. Satan hates Joel Osteen because he's helping God's people come into His presence, become effective in advancing His kingdom, and prevail against the gates of Hell.